Is there a hot-key to jump between markers in the timeline?
While @gandalf3's solution worked, I found it a little awkward to set up (user preferences that rely on scripts that need to be in your project, if I understood correctly), and I found that there's now a built-in shortcut adding feature on the menu:


In the timeline viewport menu, click Marker
Right-click on "Jump to Previous Marker"
Click on "Add Shortcut"
Hover over the pop-up "A" box, so that it turns into "Press a Key"
Hit your target combination, eg "Alt-Left"
(repeat for "Jump to Next")


I might be missing something the scripts in @gandalf3's answer provide, please let me know if so!